Improvement in crown-sheefs for steam-boilers



W.l s. HUDSON. Grown-Sheets for Steam-Boi1ers.

No. 198,743. Patented lan. 1,1878.

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Vuseful Improvements. [relating to Steam-Boilers, of which the followingis a specication UNITED? STATES PATENT WILLIAM s. Hunsel@ or PArERsoN, new JERSEY."

. LlMPRfovE'MENTUINcRowN-SHEETS EoRsTA'M-BOILERS.;

l Specification-formingpart of Letters Patent No. `198,743,dated January"'l,.1878; application filled:4 m i .i "Anglian-,alaaf i To all whom `it may concern: i

Be it known that l, WILLIAM S. HUDSON, of Paterson,. Passaic county, in the .State -of have invented certain new and The improvement pertains-l to `theucrownsheet and the parts immediatelyadjacent.- It

. is intended more particularly for locomotives,

but may be useful in a all boilershaving an internal iire-boX surrounded by water.

.l construct there-box in a generally rectangular form, with the tube-sheet of the usual height, and 'with` the adjacent part 1of the crown-sheet plain, and at-.the usual level.

The remainder of the crown-sheet is corrup l sheets, land C the `rear sheetfthat in which `the hole c is provided for the door, as usual. 2j Theforward part of the crown-sheet (marked D) is plain. The main portion D ofthe crown` sheet is corrugated, the oorrugations eXtend` ing below andnot above the plain portion D. This part is so much lower that the` highest" points inthe corrugations are about level with gated, and` is `lowered Lto anfextent a `little more than equaltotheheightof the corru- .gationsQ by the corrugations are open-ended.` They The depressions or channels formed upper edge of the tube-sheet. v 1

stand below andy not. above `the level fof `the Previous efforts in thisline have `beeny made.I

` Onesuch had theeorrugations extended above l`the top of the tube-sheet. With-.sucheonstructionthe water must be` carried higher than usual, to insurethat the corrugations, which are higher than the upper tubes, are covered.

My invention allows the tube-sheet'tobe carried up to the ordinary level with the full i number and sizeof tubes ordinarily employed without requiring the water to be carried any higher than with the usual plain crown-sheet.

Stay-bars formed to aii'ord the proper bearings may support my corrugated crown-sheet,

" the stay-bolts therefrom taking hold ofthe crown-sheet at the highest points in the several corrugations, and the stay-bars being formed withsuiiieient turned-down ends to lobtain a hrm bearing on the vertical walls at the sides or ends of the furnace.

The following is a description of what I considerithe best means of carrying outthe invention. i

'The accompanying drawings form a part of this specification.

Figure 1 is a sideelevation. Fig. 2 is a plan view. Fig. 3 is an end elevation, the

. right side being an elevation of the front end,

and theleft side an elevation of the rear end.

u Fig. 4. isfay cross-sectiom-on a larger scale, a

through` thecrown-sheet and the parts immediately adjacent.. Fig. 5` shows a modification, whichV will bedescribed farther on.

`The drawings represent the novel parts,`

with so much of the ordinary partsf'asap'- pearsneeessaryto indicate the relations thereto. l f

- Similar letters 4of reference indicate corresponding parts in allthegures.`

nary construction.

All the parts not shown maybe ofthe ordia .Referring to Figs. l `to is the tube# sheet, of the y.ordinary form,

and performing in all respects its ordinary functions; and a a, the ordinary tubes therein. B B are the side theplainpartD.l i l It-'s importantthat the corrugations or depressionsbe carried out low at the rear, to allow free circulation when the water is low.

`The crown-sheet is wrought in the required form by hand or by machinery.

The corrugations increase the amount and efficiency of the heating surface. The absence of any pockets or recesses below the edges and the .free circulation of the water prevent the accumulation of solid material. Preserving the full ordinary dimensions of the tube-sheet allows the full ordinary height and arrangement of tubes. y

The plain or uncorrugated portion D at the forward edge of the crown-sheet, kept up at the ordinary level, as shown, affords access below for expanding and calking the ends of the tubes, and affords nearly the ordinary full capacity to the furnace. The lower level of the hinder and main portion D of the crown-sheet holds the corrugations at such alevel that the tops of the ridges thereof will be covered whenever the tubes are covered. My crownsheet will be less likely to fail from want of water than the ordinary plainA crown-sheet. y The side plates B can be plain, as usual, near the top; but I produce corrugations at and near `the line immediately above the grate,

' which is liable to be most intensely heated in downward to a more than ordinary extent, as.

shown at E. .They rest upon the edges of the vertical side sheets B, and support the crown. sheet by taking hold thereof at points along the ridges of the corrugations. This is effected by means of stay-bolts e, passing through short thimbles e', all in the ordinary manner, except that the stay-bolts e must always take hold of the highest parts or ridges of the corrugations. l

Fig. 5 is a plan view, showing a modification,

in which the stay-barsE, instead of extending across the fire-box, extend forward and backward, the place of one stay-bar being shown by a dotted line, and the others being understood to be parallel thereto. With this arrangement one end only of each stay-bar need be bent down to an unusual extent, the other end resting on the dat part D; In this figure the corrugations also extend in a diierent direction, standing across instead of lengthwise of the nre-box; but I do not consider this condition absolutely material. The corrugations may extend either way fso long as the waterspaces between the ridges are open at one or both ends to allow a free circulation when the water is low.' 5

-The form shown in Fig. 5allows the water to enterthe corrugations from both sides.

'The stay-bars in either case afford a strong support' to the crown-sheet additional to the stiffness imparted by the corrugations. A less number of stay-bars may be used than is usual. If the stay-bars extend' in the' same direction as the corrugations there should be one staybar over each ridge; but Iprefer that they extend across the ridges, as shown., The stays which extend above to the arching top of the boiler (not shown) can be better spread or made to radiate if the staybars extend crosswise of the boiler. One such stay in an oblique position is indicated at F in Fig. 4.

The corrugated portion D rof my crown-sheet being, as shown, below the level of the top of the tube-sheet A, it results that'my locomotive carries a greater body of water over the furnace than usual, which I esteem an important advantage. Many modifications mayv be made by any good mechanic. Thus the number and depth of the corrugations may be greater or less than shown, and the length of the several corruga-4 tions v'and the thickness of the material may be varied. The side walls may be extended farl corrugated main body Dl lower than the front D, as and for the purposes herein specified.

- 2. The partially-corrugated crown-sheet D.

D', formed as shown, in combination with staybolts e and stay-bars E E', supporting the up-y per portions of the several corrugations and resting on rm supports, as and for the purposes shown and described.

In testimony whereof I have hereunto set my hand this 23d day of July, 1877, in the presence of two subscribing witnesses.

- WM. S. HUDSON.

Witnesses:

CHAs. C. SrE'rsoN, THOMAS D; STETsoN. 

